刚构连续梁桥悬臂施工应力控制

Stress control of cantilever construction of continuous rigid-frame bridge

通过王(岗)万(乐)铁路松花江特大桥成功的应力控制实例,较系统地介绍了现场如何采集和处理数据以尽可能消除收缩、徐变、温度等非荷载因素的影响,得到误差可被接收的实测混凝土应力值,并将得到的应力值与有限元软件BSAS计算的理论值进行比较,通过分析实测值与理论值的吻合程度来指导施工,确保大桥顺利合拢。工程实践表明,该方法可用于类似桥型的应力控制,并可为其他桥型的应力控制提供借鉴。

Through the example of successful stress control of WANG-WAN Songhuajiang Super Major Bridge,the paper systematically introduces that how to gather and process data to eliminate the effect of non-loading element,such as shrinking,creeping and temperature etc.,to collect acceptable inaccuracy of actual measurement concrete stress value,which is compared with the theoretical value calculated according to finite element analysis software.Analyzing the anastomosis degree of measured value and theoretical value can direct the construction and ensure the successful closure of the bridge.Engineering practice verifies that the above-stated method can be used in the stress control of the similar bridge type and be used as a source of reference for bridges of other types.